Senior Research Engineer (Python)

We use state-of-art AI plus intuitive UI to eliminate useless paperwork and make the whole world go faster. Help us engineer the backend for our SaaS platform to scale it to terabyte-size datasets, tens of thousands of simultaneous users and reliably serve the biggest enterprises and software vendors in the world.

We are already processing up to hundreds of documents per minute. But this volume grows exponentially and the scope of our product only slightly slower. Our final goal is so far ahead that we won’t hesitate to rewrite everything a couple times more.


Rossum is basically a Python company (not uncommon for an AI startup). We use Python for training our AI models, actual data processing and also for our backend APIs.

  • Our backend services are written in Django or Flask.
  • We are gradually chipping away loosely coupled microservices from our core components, picking the cases where it actually improves scaling and reliability.
  • From being heavy REST API users, we are moving communication of our internal components towards message queues. We most like connecting our services by RabbitMQ or Apache Pulsar.
  • We use PostgreSQL for our primary databases, partitioned to ensure queries are fast enough on our table sizes.
  • Our ML models are built with Keras and Tensorflow, and we like to rely on Kubeflow for most trainings and experiments.
  • Many of our customers are developers themselves. We love designing beautiful (and stable) APIs, and are even happy to host serverless user code as AWS lambda functions.
  • All our services are deployed in Kubernetes clusters, currently in AWS. (But we avoid relying on the AWS ecosystem too much.)
  • Our deployments and releases are 98% based on GitOps, with infrastructure defined as code and managed by GitLab-based CI+CD pipelines.


We are all geeks and hackers who like to engineer beautiful systems, all the way to Rossum’s CEO. You will fit right in if:

  • You have experience with designing and building backend systems and APIs.
  • You love programming in any language, but agree Python is one of the best ways to code.
  • You have experience with K8s, cloud platforms and event-driven systems.
  • You have experience with workflow management frameworks (e.g. Airflow, MLFlow, KubeFlow, etc.)
  • You know what it takes and ideally have experienced the delivery of an ML model (in some shape and form) into production.
  • You are used to take end-to-end responsibility for features – from discovery and design to delivery and deployment.
  • Your teams owned and operated services on their own, which is why you’ve already had personal responsibility for some or all of
    • Monitoring and Metrics Dashboards
    • Investigating and Resolving Issues in Production
    • CI/CD pipelines
    • Internal Tooling
    • Automated Tests
  • You are honest and bullshit-free. You base your opinions on data, but don’t cling on it in the face of good arguments.
  • You are passionate about your work for both technical merits and its strong purpose.


We are building a hyper-growth SaaS startup following the best Silicon Valley practices, in Prague.

  • We designed our Employee Stock Option Plan as the fairest in Prague.
  • Laptop of your choice & necessary tech is a given.
  • Beautiful office with 200 m2 terrace and a view of the Prague castle in the heart of Karlin.
  • 5 weeks of vacation, flexible working hours and home office setup.
  • Tasty snacks & the best coffee and tea in Prague.
  • English language lessons on all levels.
  • Multisport card to get your workout at any of 2 700 places in Czechia.


We are automating document communication. Thousands of lifetimes per day are burned on manually dealing with documents in enterprise backoffices. It’s a terrible job and it makes the whole world go slower. Right now, we already process up to hundreds of documents per minute to save our users 85% of this work, serving some of the world’s best companies. Our mission is creating a world that builds rather than types, as companies that switched from email to Slack and Teams for internal communication next switch to Rossum for their orders and invoices.

We raised money from some of the best VCs in Europe and top American angel investors who backed startups like AirBnB, Revolut or UiPath before. We are now pre-Series-A in terms of funding and grow 300% a year. (Learn more)